{"id":"CVE-2026-49143","sourceIdentifier":"disclosure@vulncheck.com","published":"2026-06-02T21:16:28.070","lastModified":"2026-10-08T16:17:18.667","vulnStatus":"Deferred","cveTags":[{"sourceIdentifier":"disclosure@vulncheck.com","tags":["unsupported-when-assigned"]}],"descriptions":[{"lang":"en","value":"BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated network-adjacent attackers to execute arbitrary code by submitting crafted JSON request bodies to the handler, which passes user-supplied data to vm.runInNewContext() combined with eval(). Attackers can escape the Node.js vm sandbox by leveraging a host-context Function reference through util.format to access the host process via this.constructor.constructor, achieving full remote code execution on the underlying system without any authentication."},{"lang":"es","value":"BrowserStack Runner hasta la versión 0.9.5 contiene una vulnerabilidad de ejecución remota de código en el gestor HTTP /_log que permite a atacantes adyacentes a la red sin autenticación ejecutar código arbitrario al enviar cuerpos de solicitud JSON manipulados al gestor, el cual pasa datos proporcionados por el usuario a vm.runInNewContext() combinado con eval(). Los atacantes pueden escapar del sandbox vm de Node.js aprovechando una referencia de función de contexto de host a través de util.format para acceder al proceso del host a través de this.constructor.constructor, logrando una ejecución remota de código completa en el sistema subyacente sin autenticación alguna."}],"affected":[{"source":"disclosure@vulncheck.com","affectedData":[{"vendor":"browserstack","product":"browserstack-runner","defaultStatus":"affected","repo":"https://github.com/browserstack/browserstack-runner","packageURL":"pkg:npm/browserstack-runner","versions":[{"version":"0","lessThanOrEqual":"0.9.5","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"disclosure@vulncheck.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"disclosure@vulncheck.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-03T14:02:08.658694Z","id":"CVE-2026-49143","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"disclosure@vulncheck.com","type":"Secondary","description":[{"lang":"en","value":"CWE-94"}]}],"references":[{"url":"https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/browserstack-runner-unauthenticated-rce-via-log-http-handler","source":"disclosure@vulncheck.com"},{"url":"https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}